Hagon make an rear shock unit for the NS400 - though i don't think you'll be able to get anything really fancy for it like Ohlins.

http://www.technoflexusa.com/custom_shocks/shocks_for_Honda.html

There's a custom shock for the NS400R in this list too from Technoflex

As for wavy discs, you'd have to measure up the bolt pattern on your standard discs and search around for aftermarket matches. Galfer are a manufacturer worth trying.
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